Connected: An Internet Encyclopedia
RFC 1725 - 2. A Short Digression

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### 2. A Short Digression

This memo does not specify how a client host enters mail into the transport system, although a method consistent with the philosophy of this memo is presented here:

When the user agent on a client host wishes to enter a message into the transport system, it establishes an SMTP connection to its relay host (this relay host could be, but need not be, the POP3 server host for the client host).

Next: 3. Basic Operation

Connected: An Internet Encyclopedia
RFC 1725 - 2. A Short Digression